One vertex per element, one color per generator, with an edge from x to x·s.
(1,2)(3,7)(4,6)(5,8)(9,10)(11,15)(12,14)(13,16)(19,25)(20,27)(22,29)(24,30)(26,31)(28,32) involution — undirected(1,3,4,8)(2,5,6,7)(9,11,12,16)(10,13,14,15)(17,18,21,23)(19,26,28,22)(20,24,27,30)(25,31,32,29)(1,2)(3,5)(4,6)(7,8)(11,16)(13,15)(17,19,27,32,21,28,20,25)(18,22,30,31,23,26,24,29)(2,6)(5,7)(10,14)(13,15)(17,18)(19,26)(20,24)(21,23)(22,28)(25,31)(27,30)(29,32) involution — undirected(3,8)(5,7)(18,23)(22,26)(24,30)(29,31) involution — undirectedA Cayley diagram is a choice, not a fact about the group. Another drawing of this group — in a book, or on a different generating set — may look nothing like this one.